<!DOCTYPE html>
<html lang="cn">
<head>
    <meta charset="UTF-8">
    <title>样式表</title>
    <link rel="stylesheet" href="../css/test_style.css">
    <style>
        h2 {
            color: blue;
        }
    </style>
</head>
<body>
<h1 style="color: red">这是行内样式！</h1>
<h2>这是内部样式！</h2>
<h3>这是外部样式！</h3>
</body>
</html>